US6582199B1 - Multi-stage ejector pump - Google Patents

Multi-stage ejector pump Download PDF

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Publication number
US6582199B1
US6582199B1 US09/856,111 US85611101A US6582199B1 US 6582199 B1 US6582199 B1 US 6582199B1 US 85611101 A US85611101 A US 85611101A US 6582199 B1 US6582199 B1 US 6582199B1
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Prior art keywords
gas conduit
pump
face
exhaust gas
nozzle
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Expired - Fee Related
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US09/856,111
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English (en)
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Thilo Volkmann
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control
    • F04F5/52—Control of evacuating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/467—Arrangements of nozzles with a plurality of nozzles arranged in series

Definitions

  • the invention relates to a multi-stage ejector pump. More particularly, the invention relates to a multi-stage ejector pump having at least one housing element with at least one pressure gas intake opening, at least one suction gas intake opening, at least one exhaust gas opening, and at least one nozzle arrangement.
  • the nozzle arrangement includes at least two nozzles (e.g., pressure gas nozzle, diffuser) positioned coaxially behind one another inside the housing element and axially spaced at distances from one another.
  • the housing element includes a nozzle-receiving shaft having an essentially continuous shaft wall and at least one wall opening, an ejector step for the suction gas intake in the suction gas intake slit and the nozzles that equipped with at least one circumference sealing arrangement.
  • ejector pumps in which a continuous cast profile with inner separating walls is used, and the nozzles are installed in the individual separating walls angled to the axis of the profile through holes drilled in a terraced pattern. Most of the nozzles are located in the hollow spaces on both sides of the separating walls, which serve to distribute the gas. Although the above-mentioned hermetic surfaces are eliminated, adapting and tightening the nozzles is still difficult. Moreover, the compactness of such ejector pumps is not significantly better than the modular pumps mentioned above. For tight spaces, there are ejector pumps known with a compact design, in which the nozzles are pushed from different sides against a catch into a drilled hole in the housing to receive them. Due to such a design, ejector pumps of this kind can only be designed with one stage. It is not possible to interchange the nozzles.
  • FIGS. 1 to 5 there is a general multi-stage ejector that is known from DE 44 91 977, FIGS. 1 to 5, which is characterized in that a two-stage ejector nozzle system is designed as one piece and can be pushed into a nozzle-receiving shaft.
  • the one-piece axially designed nozzle body is connected with a suction opening by means of sections with a greater inside diameter.
  • One of the limitations of using this type of pump design is that the manner of making the nozzles requires very costly shaping steps in the area of the undercut zones.
  • Another limitation of this design is that only a cylindrical or conical course of the nozzle cross-sections located behind one another can be achieved.
  • the supply of the pressure gas and the suction gas chamber are housed in flange-mounted components, which are connected with the housing body featuring the one-piece nozzle with screws, with the use of a large number of filigrane gaskets.
  • the connection for the pressure gas and the connection for the suction gas are located in a lateral face arranged parallel to the nozzle channel inside the walls of the flange-mounted components of the housing. These gas connections face away from the nozzle axis at a right angle.
  • the large number of additional sealing surfaces, in the area of the flange-mounted components of the housing makes this ejector pump prone to leaks. This risk is only slightly attenuated with the closed lateral walls of the housing base that run in a U shape along the nozzle configuration.
  • a multi-stage ejector pump which includes at least one housing element.
  • the housing element includes at least one pressure gas intake opening, at least one suction gas intake opening, at least one exhaust gas opening, and at least one nozzle arrangement.
  • the nozzle arrangement such as an ejector nozzle system, includes at least two nozzles (e.g., pressure gas nozzle and/or one or more diffusers) that are positioned coaxially behind one another inside the housing element and axially spaced at distances from one another.
  • the ejector nozzles also includes an exhaust gas outlet opening, at least one pressure gas intake opening, and at least one suction gas intake slit between adjacent nozzles and an exhaust gas outlet opening.
  • the housing element also includes a nozzle-receiving shaft (e.g., a drilled hole) having an essentially continuous shaft wall and at least one wall opening (e.g., connection opening).
  • the housing element also includes a step for the suction gas intake in the suction gas intake slit.
  • the nozzles on their outer circumference are equipped with at least one circumference sealing means.
  • the ejector nozzle system is designed to be axially inserted into the nozzle-receiving shaft.
  • the ejector nozzle system also includes a set of individual nozzle spacers.
  • the nozzles are also equipped with support elements that are axially spaced for its tilt-free or low-tilt support in relation to the shaft wall when the nozzles are inserted into the nozzle-receiving shaft.
  • At least one clamping means such as a connection plate, is provided to axially clamp or hold in position the individual nozzles and the nozzle spacers in the nozzle-receiving shaft.
  • the ejector nozzle system should consist of a set of individual nozzles (e.g., pressure gas nozzle, diffuser) and nozzle spacers, whereby the spacers leave open a space for the entry of gas between the adjacently spaced nozzles.
  • the pressure gas nozzle and/or one or more diffusers of the ejector nozzle system are referred to as nozzles.
  • the nozzles can be inserted into the nozzle-receiving shaft one after the another. By using this arrangement of nozzles, each of the nozzles can be shaped at both ends in a manner that will increase their performance.
  • each individual nozzle has at least two support elements that are axially spaced to provide for a tilt-free or low-tilt support in relationship to the shaft wall. Only in this way is the design of individual nozzles with optimized performance possible, and which provides for the simple orienting of the nozzles to a common nozzle axis, without the need to glue the nozzles on to the nozzle-receiving shaft. While a press fit of the nozzle is conceivable, preferably O-rings are used as a means of sealing the outer circumference of each individual nozzle.
  • the support elements can be cams that are distributed around the circumference of the nozzles, or something similar, but they can also be O-rings or similar means of sealing.
  • cams have the advantage of fulfilling a twofold function, since the cams serve as means of sealing at the same time as providing a tilt-free or low-tilt support.
  • at least one means of clamping is provided in order to position the nozzles and the nozzle spacers with precision. Thereby the nozzles with their nozzle spacers are axially clamped or held in position.
  • the spacers can basically be provided on the housing element, for example in the form of steps in the nozzle-receiving shaft.
  • the spacers are preferably provided as separate or one piece one piece components.
  • the spacers are preferably eccentrically positioned on the nozzles. The spacers, however designed, are inserted into the nozzle-receiving shaft. A particular high level of performance is attained when the spacers are equipped with slim catches or similar protrusions on one nozzle front end. It is preferable to provide only one single spacer of this kind.
  • a preferred arrangement of the one or the several nose-shaped spacers is selected in such a way that, between two adjacent nozzles, the spacers are assigned to the nozzles in peripheral areas with low levels of flow, for example, on the side of the nozzles located opposite the gas entry side.
  • the suction chambers are positioned parallel to the nozzle receiving shaft.
  • the use of such a the suction chamber orientation allow for the suction chambers to be simply designed in a compact manner the housing.
  • the drill hole is preferably designed as a drilled pocket hole.
  • the drill hole includes O-rings on the outer circumference of the drill hole, and flap valves are provided to create a seal for the drill.
  • the suction gas shaft is positioned parallel to the nozzle receiving shaft to reduce the number of sealing locations, while making the manufacture of the pump simpler and the arrangement of the gas feed and exhaust lines more compact.
  • the nozzle receiving shaft and the drilled hole for the suction gas both have a stepped change in diameter in the direction of the axis.
  • This step change in diameter of the nozzle-receiving shaft and the drilled hole for the suction gas is advantageous in that the hermetically sealing O-rings can be inserted by sliding only along a short region of the shaft and near the final position of the O-rings along the wall of the shaft. In the area where the diameter of the steps is greater, contact with nozzles having smaller diameters can be eliminated.
  • the compactness of the pump is further improved by providing a drilled hole for the suction gas that extends parallel to the nozzle-receiving shaft.
  • the drilled hole for the suction gas provides a passageway to supply pressured gas to the pump.
  • the axis of this drilled hole essentially and advantageously lies in parallel plane with the axis of the nozzle receiving shaft and the drilled hole for the suction gas.
  • the drill hole for the suction gas, the drill hole for the exhaust gas and the drill hole for the pressure gas are all parallel to the same longitudinal axis. As such, the suction gas, the exhaust gas and the pressure gas flow along parallel plane when entering or exiting the housing element of the multi-stage ejector pump.
  • a flat cubical block of light material or plastic can be developed as the housing element.
  • This block of material of plastic may be created from drilling out of a solid blank or formed by an injection mold process.
  • the parallel arrangement of the nozzle-receiving shaft with the suction gas shaft and/or the drilled hole for the pressure gas (pressure gas shaft) in a single housing block is of independent inventive significance.
  • prior art control valves can be used for the switching on and off of the vacuum function.
  • control valves can also be used to control the drawing off of gas from the housing element.
  • the prior art control valves are positioned in drilled holes that can run somewhat at a right angle through the drilled hole for the pressure gas and can extend into the nozzle receiving shaft. By this configuration for the control valves, a very short overall length of the ejector block is made possible.
  • the control valves can be moved back and forth inside valve sleeves.
  • the valve sleeves are set into the drilled holes for the control valves by means of O-rings and are clamped in their axis direction by a valve plate screwed on to the ejector block.
  • the valve plate contains, in a manner that is known, electromagnetic pilot or servo valves, which create or interrupt a fluid connection between the pressure gas and the valve, thus pneumatically opening or closing the control valves.
  • the multi-stage ejector pump according to the invention can be used to produce a vacuum, for example for handling applications (conveying sheet metal press production lines for vehicle body parts, pick-and-place applications in plastic injection molding and the like).
  • the multi-stage ejector pump is extremely compact and lightweight and can integrate functions in a simple manner (e.g., the electrical control of switching the vacuum on and off, the electrical control of switching the blowing off, and/or the monitoring of the level of the vacuum).
  • the present invention pertains to an improved multistage ejector pump.
  • the multi-stage ejector pump includes at least one housing element.
  • the housing element includes at least one pressure gas intake opening, at least one suction gas intake opening, at least one exhaust gas opening, and at least one nozzle arrangement.
  • the nozzle arrangement such as an ejector nozzle system, includes at least two nozzles (e.g., pressure gas nozzle and/or one or more diffusers) that are positioned coaxially behind one another inside the housing element and axially positioned from one another.
  • the nozzle arrangement also includes an exhaust gas outlet opening, at least one pressure gas intake opening, and at least one suction gas intake slit between adjacent nozzles and an exhaust gas outlet opening.
  • the housing element includes a nozzle-receiving shaft (e.g., a drilled hole) having an essentially continuous shaft wall and at least one wall opening (e.g., connection opening).
  • the housing element also includes a stepped opening size for the suction gas intake in the suction gas intake slit.
  • the nozzles on their outer circumference are equipped with at least one circumference sealing means, and the ejector nozzle system is axially insertable into the nozzle-receiving shaft.
  • the ejector nozzle system also includes a set of nozzle spacers.
  • the nozzles are equipped with support elements that are axially spaced to provide for tilt-free or low-tilt support in relation to the nozzle receiving-shaft and which support elements can be inserted into the nozzle-receiving shaft.
  • At least one clamping means such as a connection plate, is provided to axially clamp or hold in position the individual nozzles and the nozzle spacers in the nozzle receiving shaft.
  • the nozzle spacers when the suction-gas intake slits between the nozzle front ends are released, are insertable between adjacent nozzles and can be inserted into the nozzle-receiving shaft.
  • the spacers are shaped as slender noses or similar protrusions on one front end of a nozzle.
  • a single spacer is positioned in an area with low gas flow in the periphery area of the nozzles (e.g., eccentrically).
  • a suction chamber is provided in a drilled hole for the suction gas and is positioned essentially parallel to the nozzle-receiving shaft.
  • flap valves can be inserted into the drilled hole for the suction gas to form a hermetic seal.
  • the nozzle-receiving shaft and/or the drilled hole for the suction gas are made as drilled holes that are stepped or tiered in their diameter.
  • the nozzles and/or the flap valves can be inserted from a single side into a dead-end drilled hole (e.g., nozzle-receiving shaft and/or drilled hole for the suction gas).
  • a dead-end drilled hole e.g., nozzle-receiving shaft and/or drilled hole for the suction gas.
  • a drilled hole for the pressure gas extends essentially parallel to the nozzle-receiving shaft.
  • the housing element is shaped as a flat cubical block made of light material or plastic.
  • At least one drilled passage hole is provided to the drilled hole for the pressure gas and/or to the drilled hole for the suction gas.
  • At least one control valve is placed in a drilled hole to receive a valve that connects the drilled hole for the pressure gas and the nozzle-receiving shaft and controls the flow of the pressure gas through the connection opening.
  • a control valve includes a valve guide sleeve in the area of the drilled hole for the pressure gas.
  • the drilled hole for the pressure gas exhibits at least one bypass line between the inside of the drilled hole and the control valve that is controlled by a switch valve, in order to activate the control valve.
  • control valve exhibits a twofold effective tightening piston with differing piston surfaces on each of its sides.
  • FIG. 1 is an axial cross-sectional view of a multi-stage ejector pump in accordance with the present invention
  • FIG. 2 is a perspective view of the nozzle system that is partially illustrated in FIG. 1;
  • FIG. 3 is perspective view of a section of the control values in the open position that is partially illustrated in FIG. 1 .
  • FIG. 1 shows a rectangular shaped ejector block made out of drilled whole aluminum in its basic form, serving as housing element 10 .
  • a drilled hole 12 for the pressure gas which starts out from the front wall 10 C (according to the drawing) and dead-ends shortly before the rear wall 10 D opposite to it, forms a pressure gas intake opening 12 A at its mouth end.
  • the housing element 10 Parallel to the axis of formed hole 12 for the pressure gas, the housing element 10 exhibits a nozzle-receiving shaft 14 .
  • the nozzle-receiving shaft is designed as a fourfold tiered drilled hole.
  • the nozzle-receiving shaft exhibits one shaft wall 14 A, which is only interrupted by drilled holes 30 C, 32 C, 16 C and 16 D, which drilled holes are axially set off-center and run transversely to the nozzle-receiving shaft.
  • the nozzle-receiving shaft also ends up in the same front wall 10 C of the ejector block, as does the drilled hole 12 for the pressure gas, and dead-ends shortly before the ejector block rear wall 10 D opposite to front wall 10 C.
  • a third suction gas drilled hole 16 or suction shaft serving as a suction chamber is simply tiered and extends in the same plane as drilled hole 12 for the pressure gas and the nozzle-receiving shaft 14 .
  • the suction gas drill hole includes a mouth that is located opposite to the openings of the pressure gas intake opening 12 A and exhaust gas outlet opening 14 A in front wall 10 A.
  • the suction gas drill hole dead ends prior to front wall 10 A and the mouth of the such gas drill hole serves as suction gas intake opening 16 A.
  • a three-piece ejector nozzle system 18 is insertable into nozzle-receiving shaft 14 and forms a hermetic seal with the nozzle-receiving shaft 14 .
  • the three-piece ejector nozzle is comprised of a pressure gas nozzle 18 A, and a first and second diffuser 18 B and 18 C. All three individual nozzles are supported so as to be tilt-secured against the shaft wall of the nozzle-receiving shaft 14 .
  • the diffusers are supported in at least two places at axially spaced locations along the length of the ejector nozzle.
  • the gas nozzle and the diffusers are supported mainly by means of O-ring hermetic seals 20 .
  • the O-rings have been left out for the sake of visibility and only the O-ring grooves are shown.
  • the O-ring hermetic seals form a light snug fit of the pressure gas nozzle 18 A on the base of the drilled hole.
  • FIG. 1 through multiple gradations 18 D, 18 E, 18 F and 18 G in nozzle-receiving shaft 14 , the pressure gas nozzle 18 A and diffusers 18 B and 18 C of ejector system 18 can be inserted into the nozzle-receiving shaft 14 with little wear and tear.
  • pressure gas nozzle 18 A and diffusers 18 B and 18 C are positioned coaxially to one another and shaped on the inside as double cones with an optimized cross-section course; therefore they exhibit areas with a widened cross-section at both ends.
  • one piece spacers 22 A and 22 B are provided between pressure gas nozzle 18 A and diffuser 18 B, and diffusers 18 B and 18 C.
  • the spacers as shown in FIG. 2, are finger-shaped and eccentrically positioned between pressure gas nozzle 18 A and diffuser 18 B, and diffusers 18 B and 18 C. These spacers form slender extensions on one place of the circumference in the area of the front surface of the diffusers.
  • spacers 22 A, 22 B are supported on the adjacent nozzle front wall 18 A′ or 18 B′.
  • Nozzle 18 A and diffusers 18 C are secured by means of positioning nozzle 18 A and diffusers 18 B and 18 C in nozzle-receiving shaft 14 and securing nozzle 18 A and diffusers 18 B and 18 C in the nozzle-receiving shaft 14 by a connection plate 28 screwed on the front of housing element 10 .
  • connection plate 28 includes threaded drilled holes 28 A, 28 B for mating with Pressure gas connection and exhaust gas connection.
  • control valves 30 , 32 The supply of the pressure gas into the housing element is regulated by control valves 30 , 32 . These valves are inserted with O-rings 20 into tiered drilled holes 30 C and 32 C to receive the valves. These valve-receiving drilled holes extend out from one upper lateral wall 10 A of the housing element 10 into the nozzle-receiving shaft 14 .
  • the control valves are comprised of a transversally interrupted guide sleeve 30 A or 32 A and a valve tappet 30 B or 32 B with tightening pistons 30 E or 32 E. As can be seen from FIG.
  • valve tappets 30 B, 32 B and tightening pistons 30 E, 32 E initially form separate components so that they, because of their different diameter, can be used and inserted from opposite sides into the guide sleeve 30 A, 32 A.
  • a tap date (not shown) of the valve tappet 30 B, 32 B can be inserted into a central drilled hole 30 E′, 32 E′ of the tightening piston 30 E, 32 E, for the purpose of connecting the two parts, for example by screwing them together.
  • a valve plate 34 located on lateral wall 10 A of the housing element 10 is subject to sufficient pressure so form a hermetical seal.
  • the valve plate includes two pairs of drilled passage holes 36 A, 36 B and 38 A, 38 , which connect the inside of the drilled hole 12 for the pressure gas and the valve tappets 30 B or 32 B with electromagnetic switch valves 36 or 38 .
  • These switch valves 36 , 38 are controlled electrically and they either open or close the flow path for which they are constructed.
  • the back and forth movement of the valve tappets 30 B and 32 B takes places pneumatically, corresponding to the gas pressures exerted on the valve tappets, depending on whether switch valve 36 or 38 is open or closed. This takes space, taking into account the differing piston surfaces on the upper side and the tappet side of the tightening pistons 30 E, 32 E.
  • Control valve 30 is shown in its open position in FIG. 1 .
  • the pressure gas path as shown by the flow arrows, flows through nozzle 18 A, and diffusers 18 B and 18 C.
  • Control valve 32 is closed at this time because a vacuum should be created and held.
  • control vale 30 may be closed to save energy.
  • control valve 32 may be opened at the end of the working cycle.
  • pressure gas flows over conduits 32 D (shown by a broken line in FIG. 1) that runs inside the housing element 10 to suction connection 40 A of a vacuum connection block 40 .
  • the vacuum connection block houses a vacuum monitoring switch 40 B.
  • This space-saving positioning of control valves 30 and 32 is made possible by drilled holes 30 A′, 32 A′ of guide sleeves 30 A, 32 A in the area of the drilled hole 12 for the pressure gas.
  • Suction chambers 26 A and 26 B are separated from one another by the flap valves 26 B a 26 C that are inserted into the drilled hole for the suction gas so that the flap valves are hermetically sealed in the drilled hole for the suction gas.
  • the flap valves have the known effect of attaining the desired vacuum more quickly and at a higher efficiency of use of the pressure air and/or energy.
  • Suction chambers 26 A and 26 B are connected with annular gap spaces in the area of the suction gas intake slits 24 A and 25 A by connection openings 16 C and 16 D that run at an angle to the drilled hole 16 for the suction gas with the nozzle receiving shaft 14 .
  • the lateral wall 10 B of the housing element located opposite switch valves 36 and 38 , includes a drilled cross hole that can be closed by means of welsh plugs 16 E and 16 F.
  • a multi-stage ejector pump from its core outward, therefore is comprised of a flat rectangular housing element 10 that serves as the ejector block, with three drilled holes 12 , 14 , and 16 running essentially parallel to one another in the same direction as the housing element and also drilled connection holes 30 C, 32 C, 16 C, and 16 D running in a second direction at a right angle of the housing element, while the front, lateral, and rear walls 10 A through 10 D contain the mouths of the drilled holes are screwed tight to the connection plates 28 , 34 and 40 so as to be hermetically sealed or closed with welsh plugs 16 E, 16 F.
  • connection plate 28 when the pressure air is connected to connection plate 28 , control valves 30 and 32 are closed in a rest position, as are the corresponding switch valves 36 and 38 .
  • switch valve 38 In order to initiate the production of the vacuum, switch valve 38 is opened. The opening of switch valve 28 opens the passage through the connecting drilled passage holes 38 A and 38 B.
  • the tappet On account of the varying piston cross-section surfaces on the two sides of the valve tappet 30 B, the tappet is pushed into its opening position and pressure air flows through the ejector nozzle conduit, while the suction air is being drawn off. The resulting vacuum is monitored by the vacuum monitoring switch 40 B.
  • switch valve 38 is closed and is emptied of air on the outlet side, so that the valve tappet 30 B goes back into the closed position.
  • switch valve 36 is opened by electromagnetic means and thereby control valve 32 is pneumatically opened, so that pressure air reaches the vacuum connection 40 A.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
US09/856,111 1999-09-20 2000-09-20 Multi-stage ejector pump Expired - Fee Related US6582199B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE299165310U 1999-09-20
DE29916531U DE29916531U1 (de) 1999-09-20 1999-09-20 Ejektorpumpe
PCT/EP2000/009208 WO2001021961A1 (fr) 1999-09-20 2000-09-20 Pompe a ejecteur a etages multiples

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US (1) US6582199B1 (fr)
EP (1) EP1131562B1 (fr)
DE (2) DE29916531U1 (fr)
WO (1) WO2001021961A1 (fr)

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US20030180154A1 (en) * 2002-03-19 2003-09-25 Kiyoyasu Yamazaki Vacuum generator
US20060153694A1 (en) * 2003-03-11 2006-07-13 Anumsa Pneumatic suction device
US20060169028A1 (en) * 2003-02-27 2006-08-03 Christian Beyer Test-gas leak detector
US20080292476A1 (en) * 2005-12-30 2008-11-27 Ho-Young Cho Vacuum Ejector Pumps
WO2010030640A1 (fr) * 2008-09-09 2010-03-18 Dresser-Rand Company Bloc éjecteur supersonique
WO2015199596A1 (fr) * 2014-06-23 2015-12-30 Onishi Teknik Ab Éjecteur à vide multi-étagé
CN105264238A (zh) * 2012-12-21 2016-01-20 谢雷克斯公司 具有带一体阀元件的模制管嘴的多级真空喷射器
US20160047396A1 (en) * 2014-06-11 2016-02-18 Bilsing Automation Gmbh Vacuum Generator on the Ejector Principle
US9297341B2 (en) 2014-01-20 2016-03-29 Ford Global Technologies, Llc Multiple tap aspirator with leak passage
US9328702B2 (en) 2013-10-24 2016-05-03 Ford Global Technologies, Llc Multiple tap aspirator
US10202984B2 (en) 2012-12-21 2019-02-12 Xerex Ab Vacuum ejector with multi-nozzle drive stage and booster
US10371174B2 (en) 2014-04-08 2019-08-06 Vmeca Co., Ltd Vacuum pump
US10457499B2 (en) 2014-10-13 2019-10-29 Piab Aktiebolag Handling device with suction cup for foodstuff
US10753373B2 (en) 2012-12-21 2020-08-25 Piab Aktiebolag Vacuum ejector nozzle with elliptical diverging section
US10767663B2 (en) 2012-12-21 2020-09-08 Piab Aktiebolag Vacuum ejector with tripped diverging exit flow
US10794402B2 (en) 2017-10-31 2020-10-06 General Electric Company Ejector and a turbo-machine having an ejector
US20210180616A1 (en) * 2019-12-13 2021-06-17 Goodrich Corporation Multistage aspirator for inflatable assemblies
US11454463B2 (en) 2018-06-22 2022-09-27 General Electric Company Fluid eductors, and systems and methods of entraining fluid using fluid eductors
US12012975B2 (en) 2021-05-18 2024-06-18 Vtec Co., Ltd. Vacuum ejector pump with multiple nozzles

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DE102008024434A1 (de) * 2008-05-20 2009-11-26 Fleissner Gmbh Vorrichtung zur Beaufschlagung von flächigem Material mittels unter Druck stehenden Medien
DE202009019074U1 (de) 2009-11-24 2016-05-23 J. Schmalz Gmbh Druckluftbetriebener Unterdruckerzeuger
DE102014209427B4 (de) * 2014-05-19 2016-12-22 Aft Automotive Gmbh & Co. Kg Unterdruckpumpenanordnung sowie Verfahren zum Herstellen einer Unterdruckpumpenanordnung

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US10767662B2 (en) 2012-12-21 2020-09-08 Piab Aktiebolag Multi-stage vacuum ejector with molded nozzle having integral valve elements
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US10767663B2 (en) 2012-12-21 2020-09-08 Piab Aktiebolag Vacuum ejector with tripped diverging exit flow
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US10794402B2 (en) 2017-10-31 2020-10-06 General Electric Company Ejector and a turbo-machine having an ejector
US11454463B2 (en) 2018-06-22 2022-09-27 General Electric Company Fluid eductors, and systems and methods of entraining fluid using fluid eductors
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DE50010514D1 (de) 2005-07-14
EP1131562B1 (fr) 2005-06-08
WO2001021961A1 (fr) 2001-03-29
DE29916531U1 (de) 2001-02-08
EP1131562A1 (fr) 2001-09-12

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